/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard;

import java.util.List;

import proguard.classfile.util.ClassUtil;
import proguard.classfile.util.WarningPrinter;

/**
 * This class checks if the user is specifying to assume no side effects for a reasonable number of methods in a class:
 * not none and not all.
 *
 * @author Eric Lafortune
 */
public class AssumeNoSideEffectsChecker {
    private final WarningPrinter notePrinter;

    /**
     * Creates a new KeepClassMemberChecker.
     */
    public AssumeNoSideEffectsChecker(WarningPrinter notePrinter) {
        this.notePrinter = notePrinter;
    }

    /**
     * Checks if the given class specifications try to assume no side effects for all methods in a class, printing notes
     * if necessary.
     */
    public void checkClassSpecifications(List classSpecifications) {
        if (classSpecifications != null) {
            for (int classSpecificationIndex = 0; classSpecificationIndex < classSpecifications.size();
                classSpecificationIndex++) {
                ClassSpecification classSpecification =
                    (ClassSpecification)classSpecifications.get(classSpecificationIndex);

                String className = classSpecification.className;
                if (className == null) {
                    className = classSpecification.extendsClassName;
                }

                if (className == null || notePrinter.accepts(className)) {
                    List methodSpecifications = classSpecification.methodSpecifications;

                    if (methodSpecifications != null) {
                        for (int methodSpecificationIndex = 0; methodSpecificationIndex < methodSpecifications.size();
                            methodSpecificationIndex++) {
                            final MemberSpecification methodSpecification =
                                (MemberSpecification)methodSpecifications.get(methodSpecificationIndex);

                            if (methodSpecification.name == null && methodSpecification.descriptor == null) {
                                notePrinter.print(className,
                                    "Note: the configuration specifies that none of the methods of class '"
                                        + (className == null ? ConfigurationConstants.ANY_CLASS_KEYWORD
                                            : ClassUtil.externalClassName(className))
                                        + "' have any side effects");
                            }
                        }
                    }
                }
            }
        }
    }
}
